WO2012085251A2 - Procédé de fabrication de composants durcis - Google Patents

Procédé de fabrication de composants durcis Download PDF

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Publication number
WO2012085251A2
WO2012085251A2 PCT/EP2011/073887 EP2011073887W WO2012085251A2 WO 2012085251 A2 WO2012085251 A2 WO 2012085251A2 EP 2011073887 W EP2011073887 W EP 2011073887W WO 2012085251 A2 WO2012085251 A2 WO 2012085251A2
Authority
WO
WIPO (PCT)
Prior art keywords
zinc
temperature
heated
steel material
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2011/073887
Other languages
German (de)
English (en)
Other versions
WO2012085251A3 (fr
Inventor
Harald Schwinghammer
Thomas Kurz
Siegfried Kolnberger
Martin Rosner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102010056265.3A external-priority patent/DE102010056265C5/de
Priority claimed from DE102010056264.5A external-priority patent/DE102010056264C5/de
Priority claimed from DE102011053941.7A external-priority patent/DE102011053941B4/de
Priority claimed from DE102011053939.5A external-priority patent/DE102011053939B4/de
Application filed by Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Priority to CN201180068534.2A priority Critical patent/CN103547687A/zh
Priority to ES11808211T priority patent/ES2853207T3/es
Priority to EP11808211.4A priority patent/EP2655673B1/fr
Publication of WO2012085251A2 publication Critical patent/WO2012085251A2/fr
Publication of WO2012085251A3 publication Critical patent/WO2012085251A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

Definitions

  • the invention relates to a method for producing hardened corrosion-protected components with the features of claim 1.
  • press-hardened components made of sheet steel are used.
  • These press-hardened components made of sheet steel are high-strength components that are used in particular as safety components of the bodywork sector.
  • the use of these high-strength steel components makes it possible to reduce the material thickness compared to a normal-strength steel and thus to achieve low body weights.
  • a sheet steel plate is heated above the so-called austenitizing temperature and, if appropriate, kept at this temperature until a desired degree of austenitization is achieved. Subsequently, this heated board is transferred into a mold and formed in this mold in a one-step forming step to the finished component and thereby by the cooled Mold simultaneously with a speed that is above the critical hardness, cooled. Thus, the hardened component is produced.
  • the component is first, if necessary, in a multi-stage forming process, the component formed almost completely finished. This formed component is then also heated to a temperature above the Austenitmaschinestempe- temperature and optionally held for a desired time required at this temperature.
  • this heated component is transferred to a mold and inserted, which already has the dimensions of the component or the final dimensions of the component, where appropriate, taking into account the thermal expansion of the preformed component.
  • the direct method is somewhat simpler to implement, but allows only shapes that are actually to be realized with a single forming step, i. relatively simple profile shapes.
  • the indirect process is a bit more complex, but it is also able to realize more complex shapes.
  • Zinc has the advantage here that zinc not only provides a barrier protection layer such as aluminum, but cathodic corrosion protection.
  • zinc-coated press-hardened components fit better into the overall corrosion protection concept of vehicle bodies, since they are fully galvanized in today's common construction. In this respect, contact corrosion can be reduced or eliminated.
  • Zinc-coated steels are currently - with the exception of one component in the Asian region - in the direct process, i. the hot forming not used. Instead, steels with an aluminum-silicon coating are used here.
  • the zinc-iron phase diagram shows that above 782 ° C a large area is created containing liquid zinc as long as the iron content is less than 60%. However, this is also the temperature range in which the austenitized steel is thermoformed. It should also be noted, however, that if the forming takes place above 782 ° C, there is a great risk of stress corrosion by liquid zinc, which penetrates into the grain boundaries of the base steel, resulting in macrocracks in the base steel. In addition, with iron levels less than 30% in the coating, the maximum temperature for forming a safe product with no macrocracks is less than 782 ° C. This is the reason why hereby no direct forming process is operated, but that indirect forming process. This is intended to circumvent the problem described.
  • a method for hot forming a steel in which a component made of a given boron-manganese steel is heated to a temperature at the Ac 3 point or higher, kept at this temperature and then heated Steel sheet is formed into the finished component, wherein the molded component is quenched by cooling from the molding temperature during molding or after molding in such a manner that the cooling rate to MS point at least the critical cooling rate and that the average cooling rate of the molded component from the MS point to 200 ° C is in the range of 25 ° C / s to 150 ° C / s.
  • the object of the invention is to provide a method for producing provided with a corrosion protective layer sheet steel components, in which the cracking is reduced or eliminated and yet sufficient corrosion protection is achieved.
  • the object is achieved with the features of claim 1.
  • liquid metal embrittlement The above-described effect of liquid zinc cracking, which penetrates the steel in the vicinity of the grain boundaries, is also known as so-called "liquid metal embrittlement”.
  • the invention is a more favorable way by using the direct method is applied in which a zinc or a zinc alloy coated board heated is reformed and quench hardened after heating.
  • the composition of the steel alloy is adjusted within the usual composition of a magnesium drill steel (22 MnB5) so that quench hardening by a delayed transformation of the austenite into martensite and thus the presence of austenite is also possible
  • the lower temperature is carried out below 780 ° C or lower, so that at the moment in the mechanical stress is introduced to the steel, which would lead in connection with a molten zinc and austenite to the "liquid metal embritt element", just no or only still very few liquid zinc phases are present.
  • FIG. 1 shows a table showing the furnace residence time of steel plates coated with a zinc layer amounting to 140 g / m 2 with different transfer times into the forming tool and associated representative crack depths;
  • FIG. 3 greatly enlarged images showing the samples with the different transfer times
  • FIG. 4 cross-section of the samples according to FIG. 4
  • Figure 5 the zinc-iron diagram.
  • a conventional boron manganese steel for use as a press-hardening steel material is adjusted with respect to the transformation of the austenite into other phases so that the transformation shifts into deeper regions.
  • the alloying elements boron, manganese, carbon and optionally chromium and molybdenum are used as conversion inhibitors in such steels.
  • Titanium (Ti) 0, 01-0, 05
  • Titanium (Ti) 0, 03-0, 04

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Heat Treatment Of Articles (AREA)
  • Coating With Molten Metal (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un composant en acier durci présentant un revêtement de zinc ou d'alliage de zinc, consistant à matricer une tôle revêtue de zinc ou de l'alliage de zinc pour former une platine, à chauffer la platine matricée à une température ≥ Ac3, à la maintenir éventuellement à cette température sur une durée déterminée pour réaliser la formation d'austénite, à transférer la platine chauffée dans un dispositif de façonnage, à façonner la platine dans le dispositif de façonnage et à refroidir la platine dans le dispositif de façonnage à une vitesse supérieure à la vitesse de durcissement critique de manière à la durcir. Le matériau d'acier présente un comportement de transformation retardée de telle manière qu'à une température de façonnage de 600 °C à 800 °C, notamment de 730 °C à 782 °C, et notamment inférieure à la température péritectique du diagramme zinc-fer, un durcissement par trempe a lieu par transformation de l'austénite en martensite.
PCT/EP2011/073887 2010-12-24 2011-12-22 Procédé de fabrication de composants durcis Ceased WO2012085251A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN201180068534.2A CN103547687A (zh) 2010-12-24 2011-12-22 生产硬化的结构部件的方法
ES11808211T ES2853207T3 (es) 2010-12-24 2011-12-22 Procedimiento para la fabricación de componentes endurecidos
EP11808211.4A EP2655673B1 (fr) 2010-12-24 2011-12-22 Procédé de fabrication de composants durcis

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE102010056264.5 2010-12-24
DE102010056265.3A DE102010056265C5 (de) 2010-12-24 2010-12-24 Verfahren zum Erzeugen gehärteter Bauteile
DE102010056265.3 2010-12-24
DE102010056264.5A DE102010056264C5 (de) 2010-12-24 2010-12-24 Verfahren zum Erzeugen gehärteter Bauteile
DE102011053941.7A DE102011053941B4 (de) 2011-09-26 2011-09-26 Verfahren zum Erzeugen gehärteter Bauteile mit Bereichen unterschiedlicher Härte und/oder Duktilität
DE102011053941.7 2011-09-26
DE102011053939.5A DE102011053939B4 (de) 2011-09-26 2011-09-26 Verfahren zum Erzeugen gehärteter Bauteile
DE102011053939.5 2011-09-26

Publications (2)

Publication Number Publication Date
WO2012085251A2 true WO2012085251A2 (fr) 2012-06-28
WO2012085251A3 WO2012085251A3 (fr) 2012-08-16

Family

ID=45470542

Family Applications (5)

Application Number Title Priority Date Filing Date
PCT/EP2011/073880 Ceased WO2012085247A2 (fr) 2010-12-24 2011-12-22 Procédé pour produire des éléments de construction durcis pourvus de zones de différentes duretés et/ou ductilités
PCT/EP2011/073892 Ceased WO2012085256A2 (fr) 2010-12-24 2011-12-22 Procédé de fabrication de composants durcis
PCT/EP2011/073887 Ceased WO2012085251A2 (fr) 2010-12-24 2011-12-22 Procédé de fabrication de composants durcis
PCT/EP2011/073889 Ceased WO2012085253A2 (fr) 2010-12-24 2011-12-22 Procédé pour produire des éléments de construction durcis pourvus de zones de différentes duretés et/ou ductilités
PCT/EP2011/073882 Ceased WO2012085248A2 (fr) 2010-12-24 2011-12-22 Procédé de formage et de durcissement de tôles d'acier revêtues

Family Applications Before (2)

Application Number Title Priority Date Filing Date
PCT/EP2011/073880 Ceased WO2012085247A2 (fr) 2010-12-24 2011-12-22 Procédé pour produire des éléments de construction durcis pourvus de zones de différentes duretés et/ou ductilités
PCT/EP2011/073892 Ceased WO2012085256A2 (fr) 2010-12-24 2011-12-22 Procédé de fabrication de composants durcis

Family Applications After (2)

Application Number Title Priority Date Filing Date
PCT/EP2011/073889 Ceased WO2012085253A2 (fr) 2010-12-24 2011-12-22 Procédé pour produire des éléments de construction durcis pourvus de zones de différentes duretés et/ou ductilités
PCT/EP2011/073882 Ceased WO2012085248A2 (fr) 2010-12-24 2011-12-22 Procédé de formage et de durcissement de tôles d'acier revêtues

Country Status (8)

Country Link
US (2) US10640838B2 (fr)
EP (5) EP2656187B1 (fr)
JP (2) JP2014507556A (fr)
KR (3) KR20130126962A (fr)
CN (5) CN103415630B (fr)
ES (5) ES2853207T3 (fr)
HU (5) HUE054465T2 (fr)
WO (5) WO2012085247A2 (fr)

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KR20250105784A (ko) 2023-12-29 2025-07-09 현대제철 주식회사 핫 스탬핑 부품의 제조방법
KR20250105865A (ko) 2023-12-29 2025-07-09 현대제철 주식회사 핫 스탬핑 부품의 제조방법
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